"Next time, STAY IN THE CAR!"

Morty disobeys his grandpa's order to remain inside his spaceship vehicle. This causes him to get bitten by an alien snake and kill it. Morty feels so bad that he purchases a regular snake and sends it to the alien snake's planet. Unfortunately, Morty's actions make the other alien snakes realize there's life outside their own world, causing them to go after Morty. The lesson? "STAY IN THE (bleep)ING CAR!"

Example of:
Space Whale Aesop